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Ron, ASE Certified Technician

Category: Ford

Satisfied Customers: 28158

Experience: 23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs

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f150: accelerating..idle running rich (light black smoke..tail pipe

Customer Question

f150 1994 straight 6 runs but when accelerating bogges down, at idle running rich (light black smoke from tail pipe. Pluggs and distrib. new, pluggs show black soot on all. Transmission when in drive takes off in 3rd if i press accelerator 1/4 way down have power and will move truck smoothly go beyond that it will bogg. Shift to 1st will take off in 1st same problem if go beyond 1/4 acceleration boggs. i get up to 50 mpg manually shift to D trans shifts to 3RD (I think that is the D gear), Cant get it to OD due to the 1/4 accelleration issue. It will down shift manualy. OD button on shifter does not respond and will not light up. At idle accelerate throttle to floor boggs but will come out of it and accelerate smoothly. We got this from guy who put in a sterio system and alarm and fancy lights, he removed this stuff and I dont know if this could be part of my problem, hooked up a code reader to read any codes the reader got power but did nothing. fuel safety shutoff trippet, reset it.

Reply to Ron's Post: already did that, one thing that did happen is the tank 2 when switched engine dies, dont know if i mentioned that the safety shut off plunger located in passanger side was up and had to be reset. is there a reset fot the tank 2, when shifted to tank 2 the engine smoothes out then dies shift back to tank 1 and she will run with little ruffness. I need a answer for the trans also.

Ron I gave you a lot of info and you have gave me one line answers. I will gladely pay more if u answer my whole q. If not i will give u neg feed back and never use this service again I will post my whole q. to the forum comunith and post your answers. I trust u but you are used to one liners there are multiple problems here and your answer does not fix problem.

Im glad you found your problem, I have reread your question several time, and It sounds

like there were several issues, first off the transmission not shifting properly and no overdrive,lack of power, black spark plugs tell me running very rich. The first that comes to mind is a bad or missing ground to the PCM as this is one thing PCM and the Transmission share. Because you stated the previous owner had installed various accessories. I don't know if this the answer but its where I would have started.The whole point is to try and figure out how I could have helped you from here. Sometimes this isnt easy to do but I do try very hard and have been successful in the past. Just so you understand If and when you use Just answer again, you need to know that you are never required to pay for an answer until you are satisfied and find it useful and even then its up to you. You should not have hit the accept button 3 time as this charges you three times. I have requested that you get a refund and I suggest you follow up on it as well. I don't do this for the money, I do this because I like trying to help people. Im sorry that we got off on the wrong foot.

I am new at this just answer site and did not understand how it worked. Here is what I found. Like you suggested about the ecm, we removed it and inspected the ecm board. found one of the bloe which i think as a capacitor, looked like it tried to launch itself off the board, i could tell it overheated. I wiggled the two post connected to the cap and one broke off. we put it back in now knowing the ecm is bad and started it up so we can park the truck in the back lot. The ECM started re calaberating trans now shifts and it runs normal. It sounds like the ECM shut itself down to protect it self. one question I have on ECM numbers, mine is a F3TF-12A650-YB. Do I have to replace it with that same number?

Yes it has to be the same number as it is programed to run your specific engine values. You can buy PCMs rebuilt and there just as good as new. If you can find one in a salvage yard just make sure its same make and model along with same engine.. Ford goes by calibration number for replacement.

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Meet The Experts:

Ron

ASE Certified Technician

Satisfied Customers:

21833

23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs

23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs

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